devcomquickwins: Add custom domain for images example

[lauragift21]

Write an example on how to use workers to serve images from a custom domain.

Fixes: https://github.com/cloudflare/cloudflare-docs/issues/2383

[cloudflare-workers-and-pages[bot]]

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[rita3ko]

@lauragift21 do you want to try using the code switched for this one and add a TS example too? :)

[lauragift21]

lgtm, and it would make a very nice template for cloudlfare/templates repository :)

Thanks @eidam, I will add it in when this is merged.